Preheat a saucepan
First of all, you need to preheat the saucepan so that it reaches the desired heat when you want to start the process. You can put the saucepan on medium heat and do your preparation in the mean time. This will make the entire process easier and quicker for you.
Combine the ingredients in the saucepan
Once the saucepan has reached the desired heat, you can add the cold water and the whole wheat flour to it. Make sure you add both the ingredients separately and with a slight delay as that will be good for the end product.
Heat the ingredients constantly
You need to heat the mixture constantly until it reaches a boil. It is extremely important to constantly stir the mixture with a wooden spatula so that no lumps are formed in it. When you see that the mixture has reached a boil, remove it from the saucepan. You can add the end product to a small box.
Cool the mixture
If you want to use the paste later, leave it outside so that it cools down at room temperature. However, if you need it on an immediate basis, you can place it in the refrigerator for a good 30 minutes or so.
Stir the paste and use it
Before you use the paste, make sure you thoroughly stir it as lumps may form when the paste is cooling down. After stirring it, use it right away - you can use either your finger or a brush for the application.